Answered
Matrix Indexing
A = zeros(max(idx(:)),size(idx,1)); A(sub2ind(size(A),idx,cumsum(ones(size(idx))))) = 1

15 years ago | 2

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Answered
Programming Snafu's - My Numerical Analysis HW
I would paste them into the MATLAB editor and read the warnings. Also, try to run the functions and see what happens! They wil...

15 years ago | 0

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Answered
How do I write a good answer for MATLAB Answers?
Put a clarifying question in the "Comment on this Question" box instead of putting your question as an answer.

15 years ago | 4

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How do I write a good answer for MATLAB Answers?
Ask the writer of an obvious homework question (especially when no work is shown) to: # Provide the work done so far (the code...

15 years ago | 2

Question

How do I write a good answer for MATLAB Answers?
Since the question, "How do I write a good question for MATLAB answers?" has been asked, I wondered if we could benefit from the...

15 years ago | 16 answers | 16

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Answered
How do I write a good question for MATLAB Answers?
Things I like to see in a question: # Clear explanation of the problem, current code included. If the current code doesn't wor...

15 years ago | 8

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Declaring 'many' variables from work space into function workspace
Usually one should pass the variables in via the argument list. Other ways of making magic are generally frowned upon _with goo...

15 years ago | 12

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Solving for log function
Use the FZERO function. What values do you have for R_1 and R_2? F = @(a) log(1/R_1).^a - log(1/R_2).^a rt = fzero(F,.1);...

15 years ago | 1

Question

What causes MATLAB to execute pasted code automatically?
Sometimes I will copy a piece of code that someone has put up in answer to a question, then paste the code into MATLAB at the co...

15 years ago | 3 answers | 2

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Answered
Which MATLAB function can remove the diagonal elements of a NxN matrix
Your example doesn't add up, as Kenneth mentioned. However, in general you could do something like this: A = [ 0 1 2 3 1 ...

15 years ago | 6

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Answered
Matrix Indexing
Another alternative: A = zeros(1,t_off(end)+1); A(t_on) = 1; A(t_off+1) = -1; A = cumsum(A(1:t_off(end)));

15 years ago | 4

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Answered
Matrix Indexing
Bruno's MCOLON function may be what you need. <http://www.mathworks.com/matlabcentral/fileexchange/29854-multiple-colon> A...

15 years ago | 1

Answered
MATLAB GUI
UITABLE was available in 2007a, for example: T = uitable('NumColumns',4,'NumRows',6,'position',[10 10 400 300]); Now to see ...

15 years ago | 0

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Insert a matrix within a matrix
Assuming you meant x = [a,b;c,d]; then y = blkdiag(x,x)

15 years ago | 5

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Selecting words in MATLAB
You don't say how the words are divided, or even what kind of selection is to be made. However, I will assume you have three ce...

15 years ago | 3

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MATLAB GUI
Would UITABLE be what you want?

15 years ago | 0

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multiplying certain parts of an 8x8 matrix
M = magic(8) S = sum(M([1 8 57 64 28 29 36 37]))

15 years ago | 2

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controlling background color of selected uicontrol popup?
Things seem to work here as you wish, unless I misunderstand you. uicontrol('Style','popup','backgroundcol',[.9 .7 .3],'str...

15 years ago | 1

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Yaxis invisible
I don't think there is a way of doing it directly. Here is a hackey way of getting what you want for the Y-axis. Do similar fo...

15 years ago | 1

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How do I generate a vector of random integers without repeats and with j+2 constraints?
Some of your constraints would seem to be exclusive at first read. Here is an attempt at all 5: N = [1 2 3 5 6 7 8 9]; ...

15 years ago | 0

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How do I find the number of character in a text file?
fid = fopen('inp.txt'); % see also fclose A = char(fread(fid,inf)).'; A = banerjee.raktim 123456789125 >> length(A) ...

15 years ago | 1

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Answered
How do I access an Invalid-named variable from an exported MAT file that MATLAB will not recognize?
Give this a try. What is the extension of the data file? X = load('01_ExportData') % May need the extension D = struct2ce...

15 years ago | 0

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How do I use randperm to produce a completely new sequence (no numbers in same place)?
Or, perhaps more efficient even: function As = mix2(A) T = A(randperm(length(A))).'; As = zeros(length(A)); As(:,1) = T...

15 years ago | 1

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How do I use randperm to produce a completely new sequence (no numbers in same place)?
O.k., I see I misread the requirements. You want no two elements to be equal, correct? This should work too, if A is not reall...

15 years ago | 1

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How do I use randperm to produce a completely new sequence (no numbers in same place)?
You could do this with the PERMS function. A = [4 2 5 1 3]; % Sample code T = perms(A); B = randperm(size(T,1)); ...

15 years ago | 0

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Binary string to character string?
userid = char(bin2dec(reshape(watermark(1:160),[],8))).' passwrd = char(bin2dec(reshape(watermark(161:320),[],8))).' str =...

15 years ago | 1

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Answered
How do you randomize numbers but not have two consecutive numbers be the same?
Use the RANDPERM function. Depending on what you want to do, pick one of these: >> A = [1 2;3 4;5 6;7 8;9 10] % Sample Data...

15 years ago | 2

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Uniform distribution of N points within a sphere
Here is another solution which converts to Cartesian coordinates, though it does call the trig functions. function [x,...

15 years ago | 1

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Define a function for a system using Symbolic Math Toolbox
What use could an undefined function be? If you want your function to return nothing, then: y = @(t) []; would do the t...

15 years ago | 1

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Gradient and NaN
You can see what MATLAB does by looking at a plot. Look at the difference between the two figures: v = -2:0.5:2; ...

15 years ago | 0